/*=====================================================================*
 *                   Copyright (C) 2011 Paul Mineiro                   *
 * All rights reserved.                                                *
 *                                                                     *
 * Redistribution and use in source and binary forms, with             *
 * or without modification, are permitted provided that the            *
 * following conditions are met:                                       *
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 *     * Redistributions of source code must retain the                *
 *     above copyright notice, this list of conditions and             *
 *     the following disclaimer.                                       *
 *                                                                     *
 *     * Redistributions in binary form must reproduce the             *
 *     above copyright notice, this list of conditions and             *
 *     the following disclaimer in the documentation and/or            *
 *     other materials provided with the distribution.                 *
 *                                                                     *
 *     * Neither the name of Paul Mineiro nor the names                *
 *     of other contributors may be used to endorse or promote         *
 *     products derived from this software without specific            *
 *     prior written permission.                                       *
 *                                                                     *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND              *
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,         *
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES               *
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE             *
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER               *
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,                 *
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES            *
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE           *
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR                *
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 * Contact: Paul Mineiro <paul@mineiro.com>                            *
 *=====================================================================*/

#include <boost/none.hpp>
#include <map>

#include "loss.hh"

namespace
{
  std::map<std::string, flassol::LossFactory>&
  get_registry ()
    {
      static std::map<std::string, flassol::LossFactory> f;

      return f;
    }
}

namespace flassol
{

LossFactory
register_loss_factory (const std::string& s,
                       LossFactory        l)
  {
    std::map<std::string, LossFactory>& f = get_registry ();

    f[s] = l;

    return l;
  }

boost::optional<LossFactory>
get_loss_factory (const std::string& s)
  {
    std::map<std::string, LossFactory>& f = get_registry ();
    std::string::size_type pos = s.find_first_of (" (", 0);
    std::string name = (pos == std::string::npos) ? s : s.substr (0, pos);
    std::map<std::string, LossFactory>::iterator i = f.find (name);

    if (i == f.end ())
      {
        return boost::none;
      }
    else
      {
        return i->second;
      }
  }

std::string
get_registered_losses ()
  {
    std::string rv;
    std::map<std::string, LossFactory>& f = get_registry ();

    for (std::map<std::string, LossFactory>::const_iterator x = f.begin ();
         x != f.end ();
         ++x)
      {
        rv += x->first;
        rv += " ";
      }

    return rv;
  }

};
